| AIS | Automatic Identification System |
| ANM | AtoN Management |
| ASF | Additional Secondary Factor |
| AtoN | Aid(s) to Navigation |
| CIE | Commission International de l'Eclairage (International Lighting Commission) |
| CIL | Commissioners of Irish Lights |
| DfT | UK Department for Transport |
| DGNSS | Differential GNSS |
| DGPS | Differential GPS |
| e-ANSI | Electronic AtoN System Information |
| EC | European Commission |
| ECDIS | Electronic Chart Display Information System |
| ECS | Electronic Charting System |
| EEP | Engineering, Environment & Preservation |
| eLoran | Enhanced Loran |
| EMRF | European Maritime Radionavigation Forum |
| ENAV | e-Navigation |
| ENC | European Navigation Conference |
| ERDF | European Regional Development Fund |
| ERNP | European Radionavigation Plan |
| ESA | European Space Agency |
| FAA | Federal Aviation Administration (US) |
| GLA | General Lighthouse Authority |
| GNSS | Global Navigation Satellite Systems |
| GPS | Global Positioning System |
| IALA | International Association of Marine Aids to Navigation and Lighthouse Authorities |
| IEC | International Electro-technical Commission |
| ILA | International Loran Association |
| IMO | International Maritime Organisation |
| IMO MSC | IMO Maritime Safety Committee |
| IMO NAV | IMO Safety of Navigation Sub-Committee |
| INTERREG | Inter Regional European Union |
| INS | Inertial Navigation System |
| ION | Institute of Navigation (USA) |
| ISO | International Standards Organisation |
| ITU | International Telecommunication Union |
| JNRP | Joint Navigational Requirements Policy |
| LORAN | Long Range Navigation |
| LORAPP | Loran Accuracy Performance Panel |
| MCA | Maritime and Coastguard Agency |
| MIS | Management Information System |
| MNE | Marine Navigation Equipment |
| MRATC | Marine Radio Advisory and Technical Committee |
| NLB | Northern Lighthouse Board |
| NMSC | National Marine Safety Conference |
| NPL | National Physical Laboratory |
| NPL-OTMN | NPL - Optical Technology and Metrology Network |
| RACON | Radar Beacon |
| R&RNAV | Research & Radionavigation |
| RIN | Royal Institute of Navigation (UK) |
| RNAV | Radionavigation |
| RTCM | Radio Technical Commission for Maritime Services |
| SC | Special Committee |
| SG | Study Group |
| SOLAS | Safety of Life at Sea |
| TH | Trinity House |
| UKISC | United Kingdom Industrial Space Committee |
| USCG | United States Coast Guard |
| VTM | Vessel Traffic Management |
| WBS | Work Breakdown Structure |
| WP | Work Package |
| WWRNS | World Wide Radio Navigation System |
